Error in OWConcatenate, when adding `SourceID` as class_var.

[krystofair]

What's wrong?

Exception when below options used in Concatenate Widget (file:Orange/widgets/data/owconcatenate.py):

1. Use primary table and ignore_names
2. Add SourceID into class_var
   And I think, that two are enough.
   I attached tar.gz package with .ows scheme for enforce this situation.

example-scheme.tgz

I send a report before too by default mechanism in Orange btw. Although immediately I took an effort to fix it. :)

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How can we reproduce the problem?

Package tar gzipped, anyway github not agree to upload .ows directly :/

1. Data set
2. split data by row select
3. merge with described options

What's your environment?

• Operating system: Linux RHEL Compatible (Alma): : Linux $hostname 5.14.0-687.20.1.el9_8.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Jun 30 06:22:49 EDT 2026 x86_64 x86_64 x86_64 GNU/Linux
• Orange version: 3.41 - sync with master branch
• How you installed Orange: pip/uv;